// Copyright (c) 2010 SuccessFactors, Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
//     * Redistributions of source code must retain the above
//       copyright notice, this list of conditions and the following
//       disclaimer.
//
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials
//       provided with the distribution.
//
//     * Neither the name of the SuccessFactors, Inc. nor the names of
//       its contributors may be used to endorse or promote products
//       derived from this software without specific prior written
//       permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
// OF THE POSSIBILITY OF SUCH DAMAGE.

package org.owasp.jxt.tag.html;

import java.util.regex.Pattern;
import com.wutka.dtd.DTDElement;
import org.owasp.jxt.Encoder;
import org.owasp.jxt.JxtNode;
import org.owasp.jxt.TextNode;
import org.owasp.jxt.TranslateContext;

/**
 * HtmlScriptNode
 *
 * @author Jeffrey Ichnowski
 * @version $Revision: 8 $
 */
public final class HtmlScriptNode extends AbstractHtmlNode {

    public HtmlScriptNode(DTDElement element) {
        super(element);
    }

    static final Pattern NEWLINE_START = Pattern.compile(
        "^\\s*[\r\n]", Pattern.DOTALL);

    static final Pattern NEWLINE_END = Pattern.compile(
        "^.*?[\r\n]\\s*$", Pattern.DOTALL);

    boolean needsStartingNewline() {
        JxtNode node = getFirstChild();
        if (!(node instanceof TextNode)) {
            return true;
        }
        return !NEWLINE_START.matcher(((TextNode)node).getText()).lookingAt();
    }

    boolean needsEndingNewline() {
        JxtNode node = getLastChild();
        if (!(node instanceof TextNode)) {
            return true;
        }
        return !NEWLINE_END.matcher(((TextNode)node).getText()).matches();
    }

    @Override
    public void translateBody(TranslateContext ctx) {
        if (getFirstChild() != null) {
            ctx.data("//<![CDATA[");
            if (needsStartingNewline()) {
                ctx.data("\n");
            }

            Encoder textEncoder = ctx.getTextEncoder();
            Encoder exprEncoder = ctx.getExprEncoder();
            try {
                ctx.setTextEncoder(Encoder.SCRIPT_CODE);
                ctx.setExprEncoder(Encoder.JAVASCRIPT);
                translateChildren(ctx);
            } finally {
                ctx.setTextEncoder(textEncoder);
                ctx.setExprEncoder(exprEncoder);
            }

            if (needsEndingNewline()) {
                ctx.data("\n");
            }
            ctx.data("//]]>");
        }
    }
} // HtmlScriptNode
